Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA.
Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA.
EMBO Rep. 2023 Jun 5;24(6):e56317. doi: 10.15252/embr.202256317. Epub 2023 Apr 19.
Primary cilia are sensory organelles that coordinate diverse signaling pathways, controlling development and homeostasis. Progression beyond the early steps of ciliogenesis requires the removal of a distal end protein, CP110, from the mother centriole, a process mediated by Eps15 Homology Domain protein 1 (EHD1). We show that EHD1 regulates CP110 ubiquitination during ciliogenesis, and identify two E3 ubiquitin ligases, HECT domain and RCC1-like domain 2 (HERC2) and mindbomb homolog 1 (MIB1), that interact with and ubiquitinate CP110. We determined that HERC2 is required for ciliogenesis and localizes to centriolar satellites, which are peripheral aggregates of centriolar proteins known to regulate ciliogenesis. We reveal a role for EHD1 in the transport of centriolar satellites and HERC2 to the mother centriole during ciliogenesis. Taken together, our work showcases a mechanism whereby EHD1 controls centriolar satellite movement to the mother centriole, thus delivering the E3 ubiquitin ligase HERC2 to promote CP110 ubiquitination and degradation.
初级纤毛是协调多种信号通路的感觉器官,控制着发育和动态平衡。要想超越纤毛发生的早期步骤,就需要从母中心粒上除去一种远端末端蛋白 CP110,这个过程由 Eps15 同源结构域蛋白 1(EHD1)介导。我们发现,EHD1 在纤毛发生过程中调节 CP110 的泛素化,并确定了两种 E3 泛素连接酶,HECT 结构域和 RCC1 样结构域 2(HERC2)和mindbomb 同源物 1(MIB1),它们与 CP110 相互作用并使其泛素化。我们确定 HERC2 是纤毛发生所必需的,并且定位于中心粒卫星,这是一种已知调节纤毛发生的中心粒蛋白的外周聚集物。我们揭示了 EHD1 在纤毛发生过程中参与中心粒卫星和 HERC2 向母中心粒的运输的作用。总之,我们的工作展示了一种机制,其中 EHD1 控制中心粒卫星向母中心粒的运动,从而将 E3 泛素连接酶 HERC2 递送至促进 CP110 泛素化和降解。
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